#define _CRT_SECURE_NO_WARNINGS 1
#include "Date.h"
int Date::GetMonthDay(int year, int month) {
	static int day[13] = { 0,31,28,31,30,31,30,31,31,30,31,30,31 };
	if (month == 2 && (year % 4 == 0 && year % 100 != 0) || (year % 400 == 0))
	{
		return  29;
	}
	return day[month];
}
Date::Date(int year, int month, int day)
	:_year(year)
	,_month(month)
	,_day(day)
{}
Date::Date(const Date& d)
	:_year(d._year)
	, _month(d._month)
	, _day(d._day)
{}
Date& Date::operator=(const Date& d) {
	_year = d._year;
	_month = d._month;
	_day = d._day;
	return *this;
}
Date::~Date() {
}
Date Date::operator+(int day) {
	Date tmp = *this;
	tmp._day += day;
	if (tmp._day > GetMonthDay(tmp._year, tmp._month))
	{
		tmp._day -= GetMonthDay(tmp._year, tmp._month);
		tmp._month++;
	}
	if (tmp._month > 12)
	{
		tmp._year++;
		tmp._month = 1;
	}
	return tmp;
}
Date& Date::operator+=(int day) {
	*this = *this + day;
	return *this;
}
Date Date::operator-(int day) {
	Date tmp = *this;
	tmp._day -= day;
	if (tmp._day < 0)
	{
		tmp._month--;
		if (tmp._month == 0)
		{
			tmp._year--;
			tmp._month = 12;
		}
		tmp._day = GetMonthDay(tmp._year, tmp._month) + tmp._day;
		return tmp;
	}
	return tmp;
}
Date& Date::operator-=(int day) {
	*this = *this - day;
	return *this;
}
Date& Date::operator++(){
	*this += 1;
	return *this;
}
Date Date::operator++(int) {
	Date tmp = *this;
	*this += 1;
	return tmp;
}
Date Date::operator--(int) {
	Date tmp = *this;
	*this -= 1;
	return tmp;
}
Date& Date::operator--() {
	*this -= 1;
	return *this;
}
bool Date::operator>(const Date& d) {
	if (_year > d._year)
	{
		return true;
	}
	else if (_year == d._year && _month > d._month)
	{
		return true;
	}
	else if (_month == d._month && _day > d._day)
	{
		return true;
	}
	else return false;
}
bool Date::operator==(const Date& d) {
	if (_year == d._year && _month == d._month && _day == d._day)
		return true;
	else return false;
}
bool Date::operator >= (const Date& d) {
	return *this > d || *this == d;
}
bool Date::operator < (const Date& d) {
	return !(*this >= d);
}
bool Date::operator <= (const Date& d) {
	return *this < d || *this == d;
}
bool Date::operator != (const Date& d) {
	return !(*this == d);
}
int Date::operator-(const Date& d) {
	int flag = 1;
	Date max = *this;
	Date min = d;
	if (*this < d)
	{
		int flag = -1;
		max = d;
		min = *this;
	}
	int n = 0;
	while (min != max)
	{
		++min;
		++n;
	}
	return n * flag;
}
ostream& operator<<(ostream& out, Date& d) {
	out << d._year << d._month << d._day ;
	return out;
}
istream& operator >> (istream& in, Date& d) {
	in >> d._year >> d._month >> d._day;
	return in;
}